NAD T 187 User manual

NAD
SERVICE MANUAL
T187
T 187
AV Surround Sound Preamp Processor
AV Surround Sound Preamp Processor
DRAFT DATE: MAY 2012

2
SAFETY INFORMATION
HDMI, the HDMI logo and High-Definition Multimedia Interface are
trademarks or registered trademarks of HDMI Licensing LLC.DFDF

3
SERVICE SAFETY PRECAUTIONS
1. Replacing the fuses
CAUTION:
FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF
FUSE.
Reference Designator Database Part Number Description
F8001*AH 1601100002-902000 FUSE 5*20MM TIME-LAG 1.6A 250V “ROHS” “WALTER”
TSD 1.6A 250V
F8001*C 1601100003-902000 FUSE 5*20MM TIME-LAG 1A 250V “ROHS” “WALTER”
TSD1A250V
F8002*AH 1601100003-902000 FUSE 5*20MM TIME-LAG 1A 250V “ROHS” “WALTER”
TSD1A250V
F8002*C 1601100005-902000 FUSE 5*20MM TIME-LAG 500MA 250VAC TSD UL/CSA/
VDE/CCC “ROHS” “WALTER” TSD500MA250V
F8003 1601100006-902000 FUSE TIME-LAG 800MA 250VAC 5X20MM TSD UL/CSA/
VDE/CCC WALTER (ROHS)
F8401 1601100005-902000 FUSE 5*20MM TIME-LAG 500MA 250VAC TSD UL/CSA/
VDE/CCC “ROHS” “WALTER” TSD500MA250V
NOTE:
<*AH > : USA CANADIAN MODEL ONLY.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS..............................................................................................................................4 - 6
REAR PANEL / FRONT PANEL VIEW ...................................................................................................7
DISASSEMBLY INSTRUCTIONS ...........................................................................................................8
WIRING DIAGRAM .............................................................................................................. ..................9
WIRING PARTS LIST......................................................................................................... ..................10
BLOCK DIAGRAM.................................................................................................................................11
SPECIAL KEYS.....................................................................................................................................12
DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING..................................................13 - 19
PCB LAYOUT.................................................................................................................................20 - 37
SCHEMATIC DIAGRAM.................................................................................................................38 - 51
ELECTRICAL PARTS LIST............................................................................................................52 - 63
IC BLOCK DIAGRAM.....................................................................................................................64 - 75
EXPLODED VIEW.........................................................................................................................76a-76b
EXPLODED VIEW PARTS LIST ....................................................................................................77 - 78
PACKING DIAGRAM.............................................................................................................................79
PACKING PARTS LIST.........................................................................................................................80
.........................................................................................................................
APPENDIX 1 .........................................................................................................................................81
APPENDIX 2 ..................................................................................................................................82 - 84

4
SPECIFICATIONS
PRE AMPLIFIER SECTION
Rated distortion (Ext 7.1 1kHz 500mV input ,Pre-out 1V with 30kHz LPF, FL/C/FR) ≤ 0.1 %
(Ext 7.1 1kHz 500mV input ,Pre-out 1V with 30kHz LPF, SL/SR/BL/BR) ≤ 0.1 %
S/N Ratio (Ext 7.1 1kHz 500mV input ,Pre-out 1V with A-WTD, 1kΩ termination, ≥ - 85 dB
FL/C/FR/SL/SR/BL/BR)
Frequency Response (20 Hz - 20 kHz) 0 ± 1.0 dB
Channel Balance (1 dB to -40 dB, 1 kHz) ≤ 2 dB
(-41 dB to -50 dB, 1 kHz) ≤ 3 dB
Audio muting at 1 kHz ≥ 55 dB
Subwoofer out, 500 mV in (THD at 2V Pre-out, 100 Hz) ≤ 0.5 %
(S/N at 2V Pre-out, 100 Hz) ≥ 70 dB
(Min. Vol. hum. 47 kΩ w/o lter) ≥ -56 dBV
(Ext. 7.1 in 6 CH A-wtd) ≥ -65 dBV
Crosstalk (500 mV input, ref @ 1V out, 1 kHz) ≥ -60 dB
Controls
Bass (at 500 mV in, ref @ 1V out, 100 Hz) ± 10 dB ± 2
Treble (at 500 mV in, ref @ 1V out, 100 Hz) ± 10 dB ± 2
Dialog (Vol. set at ± 6 dB, 2 kHz) ± 4 dB ± 1
DOLBY DIGITAL SECTION
Channel Difference (FL ref. Track 30) ± 1.2 dB
Frequency Resporse at Dolby cong.2 SL Track 46 200 - 20 kHz ± 0.8 dB
SR Track 47 200 - 20 kHz ± 0.8 dB
C Track 44 200 - 20 kHz ± 0.8 dB
Harmonic Distortion (1 V, Audio LPF, Dolby Cong 1) FL Track 65 997 Hz ≤ 0.08 %
FR Track 67 997 Hz ≤ 0.08 %
SL Track 68 997 Hz ≤ 0.08 %
SR Track 69 997 Hz ≤ 0.08 %
C Track 66 997 Hz ≤ 0.08 %
S/N Ratio (31 for 100mV @ Pre-out, Track 35) CCIR / ARM ≥ 65 dB
Audio LPF ≥ 70 dB
A-wtd ≥ 70 dB
DOLBY PRO LOGIC II SECTION
Frequency Response
I/P mode : L, R : 1 V in, 1V @ Pre-out, Ch L/R 40 Hz 0 ± 2.0 dB
20 kHz 0 ± 2.0 dB
I/P mode : L=R : 1 V in, 1V @ Pre-out, Ch /L/R 40 Hz 0 ± 2.0 dB
Ch C 20 kHz 0 ± 2.0 dB
I/P mode : L=-R : 1 V in, 1V @ Pre-out, Ch SL/SR 40 Hz 0 ± 2.0 dB
20 kHz 0 ± 2.0 dB
S/N Ratio (200 mV in, 100mV @ Pre-out, A-WTD w/ 1 kΩ termination)
I/P mode : L, R : 1 kHz, Ch L/R ≥ 65 dB
I/P mode : L=R : 1 kHz, Ch C ≥ 65 dB
I/P mode : L=-R : 1 kHz, Ch SL/SR ≥ 65 dB
THD (2.2 V in, 100mV @ Pre-out, w/ 80 kHz LPF, 1kHz) ≤ 0.2 %
MAX VOL PLII Music mode, 1kHz, 1Vp-p, CD in, ≥ 40 dB
NOISE connect to T787 Ext 7.1, measure at T787
Spk out, with ref. to 1W S/N (L,R,C,SL,SR)

5
DTS SECTION
Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 200 ± 10 mV
Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz 0± 1.0 dB
Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 kHz ≤ 0.08 %
Frequency Response (20 Hz to 20 kHz) Track 26-30 0+2/-1.5 dB
Subwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10 charge to 15 12.5 ± 1.5 dB
NOISE MEASUREMENT
Surround mode noise (Preout) DVD input 1V (L 20-20kHz -72 dB
only), volume @ -12 dB, Enhanced Stereo 1 mode, A-WTD -75 dB
100mV Preout output reference
Surround mode noise (Subwoofer out) DVD input 1V 20-20kHz -75 dB
(L only), volume @ -12 dB, Enhanced Stereo 1 A-WTD -78 dB
mode, 1V Preout output reference
Surround mode noise (Preout) DVD input 1V (L 20-20kHz -48 dB
only), maximum volume, Enhanced Stereo 1 mode, A-WTD -50 dB
100mV Preout output reference
Surround mode noise (Subwoofer out) DVD input 1V 20-20kHz -67 dB
(L only), maximum volume @ -12dB, Enhanced A-WTD -72 dB
Stereo 1 mode, 1V Preout output reference
AM TUNER SECTION
Input level is expressed as the reading in open circuit
of 75-ohm source impedance signal generator
Usable sensitivity (1008 kHz) ≤ 55 dBμV
S/N Ratio (5 mV in) ≥ 38 dB
THD (5 mV in) ≤ 3 %
IF Rejection (603 kHz) ≥ 40 dB
Image Rejection (1404 kHz) ≥ 48 dB
Selectivity (999 or 1017 kHz)≥ 23 dB
Output (1008 kHz) 230 -30/+60 mV
Loop sensitivity (20 dB S/N)
(999/1000 kHz) ≤ 66 dB
(603/600 kHz) ≤ 66 dB
(1404/1400 kHz) ≤ 66 dB
Frequency Response (100 - 1.8 kHz, 5 mV) - 6 dB
FM TUNER SECTION *C *AH
Input level is expressed as the reading in open circuit
of 75-ohm source impedance signal generator
Usable sensitivity (98.1 MHz) ≤ 9 dBμ ≤ 9 dBμv
S/N Ratio (60 dB, IHF wtd) Mono ≥ 65 dB ≥ 65 dB
Stereo ≥ 55 dB ≥ 55 dB
Frequency Response (20 Hz - 15 kHz, 60 dBμ) 0 ± 3 dB 0 ± 3 dB
Channel Separation (60 dBμ) 100 Hz ≥ 30 dB ≥ 30 dB
1k ≥ 30 dB ≥ 30 dB
10 kHz ≥ 20 dB ≥ 20 dB
AM Suppression (60 dBμ, 100% Mod. FM, 30% Mod. AM) ≥ 40 dB ≥ 40 dB
Image Rejection (106.1 MHz) − ≥ 75 dB

6
I.F. Rejection (90.1 MHz) ≥ 75 dB −
THD (60 dBμ, L=R 75 kHz for AH, 40 kHz Dev for C) Mono ≤ 0.7 % ≤ 0.7 %
Stereo ≤ 0.1 % ≤ 0.1 %
Auto-Search Sensitivity On ≥ 24 dBμ ≥ 24 dBμ
Off ≤ 15 dBμ ≤ 15 dBμ
RDS decode Sensitivity ≤ 33 dBμ −
Output level (98.1 MHz) 600 ± 100 mV 600 ± 100 mV
PHYSICAL SPECIFICATIONS
Dimensions (Width x Height x Depth) 435 x 150 x 385 mm (Gross)*
Net Weight 9.6 kg
Shipping Weight 13.5 kg
* Gross dimension includes feet, volume knob and extended rear panel terminals.

7
FRONT PANEL
REAR PANEL / FRONT PANEL VIEW
REAR PANEL
1. 7.1 CHANNEL INPUT
2. AUDIO PRE-OUT
3. FM/AM ANTENNA TERMINAL
4. XM MODULE INPUT (120V
version model only)
DAB MODULE INPUT (230V
version model only)
1. STANDBY BUTTON
2. STANDBY LED
3. NAVIGATION and ENTER
BUTTONS
4. REMOTE SENSOR
5. VACUUM FLUORESCENT
DISPLAY (VFD)
6. SOURCE
7. VOLUME
8. PHONES
5. ETHERNET/LOCAL AREA NET
WORK (LAN) PORT
6. MP DOCK
7. RS 232
8. +12V TRIGGER OUT / IN
9. IR IN/IR OUT
10. AUDIO 1-6/VIDEO 1-3/S-VIDEO 1-3
AUDIO 3-4 OUT
11. ZONE 2-3-4
12. COMPONENT VIDEO INPUT 1-3
COMPONENT VIDEO OUT
13. HDMI (HDMI IN 1-6 HDMI OUT 1-2)
14. DIGITAL AUDIO (COAXIAL
1-3 OPTICAL 1-3)
DIGITAL AUDIO OUT (OP
TICAL COAXIAL)
15. AC MAINS INPUT
16. SWITCHED AC OUTLET
17. POWER
9. MEMORY
10. INFO
11. AM/FM/DB
12. TUNER MODE
13. LISTEN MODE
14. TONE
15. TONE DEFEAT
16. FRONT INPUT/MP
17. FRONT INPUT PORTS
18. FRONT MP/MIC INPUT
NAD T187
© NAD T 187
AV Surround Sound Preamp Processor T 187
aSOURCE s
VOLUME
MEMORY
sa
d
f
INFO
DELETE
AM/FM/DB TUNER MODE LISTEN MODE TONE TONE DEFEAT FRONT INPUT/MP
4 5 6 7
17
A B C ED
12 13 14 15 1611
1 2 3
181098
© NAD T 187
SUBW SUBW 2
SUBW 1 CENTERSURR-BSURRFRONT
R L
AUDIO
PRE-OUT
CENTERSURR-BSURRFRONT
AUDIO 6 AUDIO 5
YP
BPR
Y3 2 1PBPR
YPBPR
YPBPR
OUT AUDIO 4 IN
ZONE 4 ZONE 3 ZONE 2
OUT AUDIO 3 IN AUDIO 2 AUDIO 1 ZONE 2
HDMI IN 6 HDMI IN 5
XM
DAB
230V VERSION ONLY
ANTENNA
FM GND AM
HDMI IN 4
HDMI IN 3
32
COAXIAL OPTICAL
13 2 1
HDMI IN 2 HDMI IN 1 HDMI OUT 2 HDMI OUT 1
SWITCHED
POWER
+12V TRIGGER
OUT 1 OUT 2
INOUT 3OUT 2OUT 1IN OUT 3
RS-232
ON
AC OUTLET 120V ~ 60Hz
120W 1A MAX
SWITCHED
AC OUTLET 230V ~ 50Hz 120W 0.5A MAX
OUT
ETHERNET
MP
DOCK
DATA PORT
OUT
R
7.1 CH INPUT
LR
AUDIO
L
S-VIDEO
IN
32
1
VIDEO
MONITOR
OUT
VIDEO
HDMI
DIGITAL
AUDIO
230V VERSION ONLY
1 2 3 4 5 6
14 17
7 8 9
1510 12 13
16

8
DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M4.0 x 8.0 (x6pcs) from the side panels.
Remove tapping screw 3.0 x 8.0 (x 3pcs) from the back panel.
Refer to Figure No. 1.
2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35 ° and then
remove in the direction as indicated. Refer to Figure No. 2.
Figure No. 1
Figure No. 2

9
WIRING DIAGRAM

10
WIRING DIAGRAM PARTS LIST
Item Database Part Number Description Remark
1 0600100367-902000 CABLE ASSY UL1007 AWG26 5PIN 2.5P L=400mm PSU BD-J8002A
“ROHS”
2 0600100153-902000 CABLE ASSY UL1672 AWG16 1PIN BLUE L=140mm PSU BD-J8011A
FASTON 4.8mm “ROHS”
3 0600100154-902000 CABLE ASSY UL1672 AWG16 1PIN BROWN L=140mm PSU BD-J8012A
FASTON 4.8mm “ROHS”
4 0600100150-902000 CABLE ASSY UL2854 AWG26 3PIN 2.5P L=110 “ROHS” VOLUME BD-
J6004C
5 0600100323-902000 CABLE ASSY UL2468 AWG26x1C 7PIN 2.5P L=240mm VOLUME BD-
“ROHS” J2016A
6 0600100392-902000 CABLE ASSY UL1007 AWG26 3PIN 2.5P L=230mm PCU BD-J8004A
WHT/BLK “ROHS”
7 0600100321-902000 CABLE ASSY UL1007 AWG24 2PIN 2.5P L=220mm PCU BD-J8003A
“ROHS”
8 0600100189-902000 CABLE ASSY UL2651 AWG28 20PIN L=120mm PCB KEY BD-J2002A
MOUNT “ROHS”
9 0600100067-902000 CABLE ASSY UL1533 AWG26 6PIN 2.5P L=200mm F-INPUT BD-
“ROHS” J2006A
10 0600100132-902000 CABLE ASSY UL1007 AWG26 6PIN 2.5P L=150mm F-INPUT BD-
“ROHS” J2005A
11 0600100146-902000 CABLE ASSY UL2854 AWG26 3PIN 2.5P L=310 “ROHS” CONN#1-J9006A
12 06001000147-902000 CABLE ASSY UL2854/1533 AWG26 5PIN 2.5P CONN#1-
L=230/320 “ROHS” J9004A/J9005A
13 0600100158-902000 CABLE ASSY UL2854 AWG26 3PIN 2.5P L=230mm CONN#1-
“ROHS” J9008A/B
14 0600100352-902000 CABLE ASSY UL1007 AWG18 2PIN 3.96P L=220mm PSU BD-J9009A
“ROHS”
15 0600100148-902000 CABLE ASSY UL1007 AWG18 1PIN L=320MM W/ CONN#1-
HEADER “ROHS” JP9001A
16 0610100014-902000 CABLE ASSY FFC 11 PINS P1.25 L=280mm “ROHS” TUNER-J6003A
17 0600100032-902000 CABLE ASSY UL1015 AWG16 1PIN GREEN/YELLOW 1-CHASSIS
L=100mm “ROHS” GND 1-AC
OUTLET GND
18 0610100013-902000 CABLE ASSY FFC 19 PINS P0.5 L=400mm VM150X HDMI
BLACK/ WHITE “ROHS” BD-J204
19 0600100356-902000 CABLE ASSY UL1007 AWG28 3PIN 2.5P L=370mm F-HDMI BD-
“ROHS” J9401A
20 0600100162-902000 CABLE ASSY UL1672 AWG18 1PIN BLUE L=80mm 1-INLET/PSU
“ROHS” BD 1-OUTLET/
PSU BD
21 0600100163-902000 CABLE ASSY UL1672 AWG18 1PIN BROWN L=80mm 1-INLET/PSU
“ROHS” BD 1-OUTLET/
PSU BD
22 0600100165-902000 CABLE ASSY UL2651 AWG28 26PIN L=450mm “ROHS” TRIGGER MCU
BD-J2301C
23 0600100148-902000 CABLE ASSY UL1007 AWG18 1PIN L=320MM W/ DSP BD-J11
HEADER “ROHS”
24 0601000366-902000 CABLE ASSY UL1007 AWG18 1PIN BLACK L=150mm F-INPUT BD-
W/ RING “ROHS” END

11
BLOCK DIAGRAM

12
SPECIAL KEYS
Function
Keys
Notes
Factory Reset Source Down + Front/MP
Toggle IR Channel Source Down + Power
System Info Source Down + Source Up
MIC Test Source Down + Tone Defeat
VFD Test Source Down + Display
PAL/NTSC Source Down + Memory
9k/10k Source Up + Tuner Band Must reselect AM before change takes effect.
XM 1kHz Test Tone Tuner Band + Tuner Mode XM must be selected first.
XM Signal Strength Tuner Mode for 0.5 seconds XM must be selected first.
XM Diagnostics Mode Tuner Mode for 3 seconds XM must be selected first.
Check DAB Module Version Tuner Mode for 3 seconds DAB must be selected first.
Enter Diagnostics Mode Source Down + Enter
Diagnostic Mode Down Source Down + Cursor Right
Diagnostic Mode Up Source Down + Cursor Left
Power Off All Zones Power Toggle or Power Off for 3
seconds

13
DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING (T187)

14

15

16

17

18

19

20
PCB LAYOUT
MAIN BOARD - COMPONENT SIDE